Abba Hassan gave the figure during a telephone news conference to journalists. (Reporting by Lanre Ola; Writing by Tim Cocks (http://blogs.reuters.com/search/journalist.php?edition=us&n=tim.cocks&); Editing by Robin Pomeroy (http://blogs.reuters.com/search/journalist.php?edition=us&n=robin.pomeroy&))
Source: Reuters.com